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Phase Engineering of CoMoO 4 Anode Materials toward Improved Cycle Life for Li + Storage †
Author(s) -
Huang Xiaoqing,
Li Junhao,
Zhang Wenbiao,
Huang Wenjie,
Yang Lichun,
Gao Qingsheng
Publication year - 2021
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.202000646
Subject(s) - anode , nanorod , electrochemistry , lithium (medication) , chemistry , chemical engineering , energy storage , nanotechnology , electrode , materials science , endocrinology , quantum mechanics , medicine , power (physics) , physics , engineering
Main observation and conclusion Anode materials based on conversion reactions usually possess high energy densities for lithium‐ion batteries (LIBs). However, they suffer from poor rate performance and cycle life due to serious volume changes. Herein, α/β‐CoMoO 4 heterogeneous nanorods are synthesized via a facile co‐precipitation method, and further are phase‐engineered through varying calcination temperature, accomplishing the obviously improved cycle life and rate performance as anodes for LIBs. When evaluated at a current density of 1.0 A·g –1 , the optimal nanorods with an α/β phase ratio of 6.0 afford the reversible capacity of 1143.6 mAh·g –1 after 200 cycles, outperforming most of recently reported bimetal oxides. Li + storage mechanism is further analyzed by using in‐situ X‐ray diffraction and ex‐situ transition electronic microscopy. It's revealed that β‐CoMoO 4 follows a one‐step conversion reaction; while α‐CoMoO 4 proceeds an intercalation pathway before the conversion reaction. Grading storage of Li + would alleviate the volume effect of heterostructured α/β‐CoMoO 4 , forming electronically conductive network evenly composed of Co and Mo nanograins to enable the reversible electrochemical conversion. This work is anticipated to give some hints for the rational design of high‐performance energy materials.